Snagging grinder



March 29, 1955 c. SODERLUND SNAGGING GRINDER 3 Sheets-Sheet 1 Filed Aug.13, 1952 INVENTOR. EARL Sums/ L/JNI] M bimon- ATTORNEY Filed Aug. 13,1952 C. SODERLUND SNAGGING GRINDER 3 Sheets-Sheet 3 "a I [04 7 I 54 728/-L/ 28 65@ f 65!) INVENTOR.

ATTURN EY United States Patent SNAGGING GRINDER Carl Soderlund,Worcester, Mass., assignor to Norton Company, Worcester, Mass., acorporation of Massachusetts Application August 13, 1952, Serial No.304,170

Claims. (Cl. 51-35) The invention relates to grinding machines, and moreparticularly to a snagging grinder for surfaces, billets and the like.

One object of the invention is to provide a simple and thoroughlypractical snagging grinder. Another object is to provide a snagginggrinder which is arranged so that it may be operated and controlled witha minimum amount of manual exertion. Another object is to provide amounting for a swing frame grinder which may be transversedlongitudinally and transversely and may be raised and tilted in avertical plane as desired. Another object is to provide an adjustablymounted weight mechanism for supplying the desired operating pressure ofthe grinding wheel upon the work piece being ground. A further object isto provide a readily controllable transversing mechanism whereby theweight may be readily adjusted and positioned from the operating controlstation. Other objects will be in part obvious or in part pointed outhereinafter.

In the accompanying drawings in which is shown one of various possibleembodiments of the mechanical features of this invention:

Figure 1 is a side elevation of the snagging grinding machine;

Figure 2 is a fragmentary plane view, on an enlarged scale, of thecontrol handles;

Figure 3 is a front elevation of the machine;

Figure 4 is a fragmentary detailed view of the gearing in the chainhoist unit;

Figure 5 is a fragmentary vertical sectional view, on an enlarged scale,taken approximately on the line 5-5 of Figure l;

Figure 6 is a side elevation, on an enlarged scale, of the fluidactuated tractor unit; and

Figure 7 is a right hand end elevation of the unit as I shown in Figure6.

A snagging grinder has been illustrated in the drawings comprising alongitudinally transversable frame 10 which is formed of a Weldedchannel beam construction comprising a rectangularly shaped base portion11 having a pair of spaced trapezoidally-shaped frames 12 and 13 whichsupport a transversely extending I-beam 14 which serves as a slidewayfor a transversely movable slide 15 which will be hereinafter described.

The frame 10 is provided with a pair of spaced rotatable shafts 16 and17 which are journalled in suitable bearings thereon. The shafts 16 and17 are provided with two pairs of spaced wheels 18, 18a and 19,respectively (only three of which are shown). The wheels 18 and 19 arearranged to roll upon a pair of spaced rails or guideways 21 and 22 tofacilitate a longitudinal transversing movement of the frame 10. Therails or guideways 21 and 22 are fixedly mounted on a base 20.

A power operative transverse mechanism is provided on the frame 10comprising a motor driven gear reduction unit 23 which is mounted on thebase portion 11 of the frame 10. The unit 23 is provided with a drivenshaft 24 having sprocket 25 which is connected by a link chain 26 with asprocket 27 fixedly mounted on the shaft 16. The motor driven gearreduction unit is preferably driven by a reversible electric motor 28which is con trolled by a push button reversing switch 30. The reversingswitch 30 comprises a pair of push buttons 31 and 32 for controlling thedirection of rotation of the motor 28 so as to control the direction oflongitudinal traversing movement of the frame 10. A rheostat 33,

2,704,912 Patented Mar. 29, 1955 mounted on the frame 12, is provided tofacilitate controlling the speed of the motor unit 23 thereby to controlthe traversing speed of the frame 10 in either direction.

The transversely movable slide 15 is preferably formed with a U-shapedcross section. The slide 15 is provided with a pair of spaced rollers 35and 36 adjacent to the forward end of the slide 15 and a pair of rollers37 and 38 located adjacent to the rearward end thereof. The rollers 3536and 3738 are arranged to roll upon the opposite channel faces 39 of theI-beam 14 to facilitate a transverse movement of the slide 15.

A suitable power operated mechanism is provided for traversing the slide15 transversely relative to the frame 10 in either direction as desired.This mechanism may comprise a motor driven fluid operated tractor unit40, such as for example that known as the Calabar fluid tractor, whichis manufactured by the Calabar Corporation of Southgate, California. Theunit 40 comprises a frame having two pairs of spaced wheels 41, 42 and42a (only three of which have been illustrated) which are rotatablysupported on the frame of the unit 40. The rollers 41, 4242a ride Withinthe opposed channelled surfaces of the I-beam 14 and serve as a rollersupport for the unit 40. The unit 40 comprises an electric motor 43which is connected by a rotary fluid coupling 44 with a shaft 45. Theshaft 45 is provided with a sprocket 46 which is connected by a linkchain 47 with a sprocket 48. The sprocket 48 is mounted on the righthand end of a rotatable shaft 49. A worm 50 is formed integral the shaft49 and meshes with a worm gear 51 mounted on a rotatable shaft 52. Theshaft 52 supports a driven wheel 53 having a peripheral surface infrictional driving engagement with the lower plane surface 54 of theI-beam 14. The electric motor 43 is preferably a reversible motor whichmay be readily controlled by a push button reversing switch 55. Thereversing switch 55 comprises a pair of push buttons 56 and 57.

The tractor unit 40 is connected to the slide 15 by means of a link 60(Fig. 1). The link 60 is pivotally connected by a stud 61 to the tractorunit 40. The other end of the link 60 is connected by a stud 62 with theslide 15. It will be readily apparent from the foregoing disclosure thatactuation of the push button 56 serves to start the motor 43 to cause aforward movement of the tractor unit 40 and the slide 15, that is, in adirection toward the left (Fig. 1). Similarly actuation of the pushbutton 57 causes a reverse rotation of the motor 43 to cause a rearwardmovement of the tractor unit 40 and the slide 15.

The slide 15 supports a carrier 65 which is made up of a pair of channelirons 65a and 65b welded together (Flg. 5) to form a boxlike structure,fl1e ends of which are enclosed by a pair of end plates or caps 65c and65d (Fig. l). The carrier 65 is supported by a manually operable chainhoist 66 having a manually operable actuating chain 67. The hoist isprovided with a hook 68 which is fastened to an eye 69 depending fromthe slide 15. The lower end of the hoist 66 is provided with a hook 70which engages an eye 71 fastened to the upper surface of the carrier 65so as to form a pivotal flexible connection between the slide 15 and thecarrier 65. The forward end of the carrier 65 is supported by a poweractuated electric hoist 72, such as for example a Yale Midget Kingelectric hoist manufactured by the Yale and Towne Manufacturing Companyof Philadelphia, Pennsylvania. The hoist 72 is provided with a hook 73which engages an eye 74 depending from the forward end of the slide 15.The lower end of the hoist is provided with a book 75 which engages aneye 76 fixedly supported on the forward end of the carrier 65. The hoist72 is provided with a manually operable control handle 77 which isarranged to actuate a rock shaft 78 which in turn actuates a start andstop switch (not shown) and a motor brake to be hereinafter described.The hoist 72 contains an electric motor 79 (Figs. 1 and 3) having amotor shaft 80 (Fig. 4) which is provided with a gear 81. The gear 81meshes With a gear 82 carried by a rotatable shaft 83. The shaft 83 isprovided with a gear 84 which meshes with a gear 85 mounted on arotatable shaft 86. The shaft 86 is provided with a driving sprocket 87for actuating a roller type link chain 88 the lower end of whichsupports the hook 75.

In order to control the rapid stopping and starting of the hoist, asuitable motor brake is provided comprising a brake drum 89 fixedlymounted on the motor shaft 80. A pair of pivotally mounted brake shoes90 and 91 are arranged diagrammatically on opposite sides of the drum89. The brake shoes 90 and 91 are pivotally supported on studs 92 and 93respectively. A pair of spaced compression springs 94 and 95 carried bya rod 96 serve normally to maintain the brake shoes in brakingengagement with the drum 89. The inner end of the rock shaft 78 isprovided with a portion of rectangular cross section 97 which ispositioned between the heads of a pair of adjusting screws 98 and 99carried by the brake shoes 90 and 91. It will be readily apparent fromthe foregoing disclosure that when the control handle 77 is rocked ineither direction to start operation of the hoist 72, the rockingmovement of the rock shaft 78 rocks the portions 97 so as to spreadadjusting screws 98 and 99 and thereby to rock the brake shoes 90 and 91respectively out of engagement with the brake drum 89 to start theactuation of the hoist 72. Similarly when the handle 77 is rocked tostop the actuation of the hoist 72, the returning of the portion 97 ofthe rock shaft 78 into the portion illustrated in Figure 4 serves torelease the compression of the springs 94 and 95 thereby moving thebrake shoes 90 and 91 respectively into braking engagement with the drum89 rapidly to stop the motion of the hoist 72.

It is desirable to connect the carrier 65 with the slide so that it willmove longitudinally with the slide 15. This is preferably accomplishedby providing downwardly extending angle iron brackets 100 and 101 whichare fixedly mounted on opposite sides of the slide 15. The lower ends ofthe brackets 100 and 101 are provided with cylindrically shaped bosses102 and 103 respectively which set within parallel flanged surfaces 104and 105 which are fixedly mounted on the carrier 65. It will be readilyapparent from the foregoing disclosure that the bosses 102 and 103between flanged surfaces 104 and 105 forms a trunnioned support for thecarrier so that the carrier 65 is free to move vertically or to betilted in a vertical plane relative to the slide 15 and is arranged tomove transversely with the slide 15.

A swing frame grinder 110 is provided with a forwarding bracket 111which is supported by a hook 112 depending from the carrier 65. Thebracket 111 is clamped onto a rotatable sleeve carried by the swingframe grinder 110. An electric motor 114 is supported on the right wheelspindle 117 mounted at the left hand end of the v (Fig. 1.) It ispreferable to swing frame grinder 110. provide an additional support forthe swing frame so that it may be moved transversely by movement of theslide 15 or longitudinally by movement of the frame 10. The left handend of the swing frame grinder 110 is connected by a stud 118 with abracket 119, depending from the left hand end of the carrier 65. If itis desired to actuate the swing frame grinder 110 manually, the stud 118may be removed and the swing frame may be manually actuated by thehandle bars 120. In this condition the swing frame grinder 110 may beswung in any direction, that is, in a vertical plane or a horizontalplane or the swing frame may be rocked about its longitudinal axis asdesired.

In order to obtain one of the main objects of the invention, it isdesirable to provide an adjustable mechanism whereby the grindingpressure of the grinding wheel 116 on the work piece may be varied ifdesired. As illustrated in the drawings a rectangularly shaped weight125 is provided within a central aperture 126 formed within the carrier65. The weight 125 is provided with two pair of spaced rollers 127 and128 which roll upon a guide surface 129 formed within the channel irons65a and 65b of the carrier 65.

It is desirable to provide a suitable mechanism for readily adjustingthe position of the weight longitudinally relative to the carrier 65 sothat the grinding pressure may be readily varied as desired. In thepreferred construction, a rotatable feed screw 130 is rotatablysupported at its right hand end by the end cap 65d of the carrier 65.The feed screw 130 is screw threaded into the weight 125. A motor drivengear reducer unit 131 is mounted on the upper surface at the right handend of the carrier 65. The unit 131 is provided with a driven shaft 132having a sprocket 133 which is connected by means of a link chain 134with a sprocket 135 mounted on the right hand end of the feed screw 130(Fig. 1). The motor driven reducer unit is preferably driven by areversible motor so that the direction of the rotation of the said screwmay be readily changed as desired. A push button control switch 136 ismounted on the forward end of the carrier 65 within easy reach from thecontrol station. By manipulation of the switch 136, the weight 125 maybe readily transversed longitudinally within the carrier 65 to obtainthe desired grinding pressure.

A work piece 140, such as, a billet or other similar object to be groundis mounted on a work supporting platen 141. By imparting a longitudinalor a transverse movement to the grinding wheel 116, the upper surface ofthe billet may be readily ground as required.

The operation of the improved snagging grinder will be readily apparentfrom the foregoing disclosure. A work piece, such as the billet 140 ismounted on the work supporting platen 141. The hoists 66 and 72 are thenactuated to position the carrier 65 in a substantially horizontalposition with the grinding wheel 116 in engagement with the uppersurface of the work to be ground. In this position of the parts, thehoist 72 is actuated by the control handle 77 to slack-off on theforward end of the carrier 65 so that the combined weight of the forwardportion of the carrier 65 and the adjustable weight 125 serves toprovide the desired grinding pressure between the grinding wheel 116 andthe work piece 140. In this position of the parts, the frame 10 may betransversed longitudinally in either direction by actuation of the pushbuttons 31 and 32. Actuation of the push button 31 causes the frame 10to move toward the right (Fig. 3) and actuation of the push button 32serves to cause the frame 10 to move in a direction toward the left.Actuation of the push buttons 56 and 57 produces a transverse movementof the slide 15 together with the carrier 65 and the grinding wheel 116.Actuation of the push button 56 causes a forward movement of the slide15, that is, toward the left (Fig. 1). Actuation of the push button 57causes a rearward movement of the slide 15, that is, toward the right(Fig. 1). It will be readily apparent from the foregoing disclosure thatby manipulation of the push buttons 31-32 and 5657, the grinding wheel116 may be traversed longitudinally in either direction and movedtransversely in either direction so that the entire upper face of thebillet may be ground. If more or less grinding pressure is desired, thepush button switch 136 may be actuated to shift the weight 125longitudinally relative to the carrier 65. If it is desired to grind asmall area on the work piece, such as, removing a pit or a seam in asmall portion thereon, the wheel 116 may be given a short longitudinaltraverse movement by actuation of the push buttons above described orthe stud 118 may be removed and by manipulation of the handle bars 120the swing frame grinder 110 may be actuated manually to produce thedesired grinding action.

It will thus be seen that there has been provided by this invention agrinding machine in which the various objects hereinabove set forth havemany thoroughly practical advantages. As many possible embodiments maybe made of the above invention and as many changes might be made in theembodiments above set forth, it is to be understood that all matterhereinbefore set forth or shown in the accompanying drawings is to beinterpreted as illustrative and not in a limiting sense.

I claim:

1. A snagging grinder comprising a longitudinally movable carriage,power operated means on said carriage to traverse said carriagelongitudinally in either direction, a transversely movable slide on saidcarriage, slidably mounted power operated means operatively connected tosaid slide and arranged to traverse said slide transversely in eitherdirection relative to the carriage, a carrier adjustably and flexiblysupported on said slide, a motor driven rotatable grinding wheel on saidcarriage, an adjustably mounted Weight on said carrier, means includinga nut and screw mechanism on the carrier for adjusting the position ofthe weight relative to the carrier, and means including a power operatedmeans on said carrier operatively connected to rotate said screw so asto actuate said nut and screw mechanism to facilitate varying thepressure of the grinding wheel relative to the work piece being ground.

2. A snagging grinder comprising a base, a longitudinally movablecarriage on said base, spaced guideways on said base to support saidcarriage, power operated means on said carriage operatively connected totraverse said carriage longitudinally in either direction, atransversely movable slide on said carriage, guideways on said carriagefor supporting said slide, slidably mounted power operated meansoperatively connected to said slide and arranged to traverse said slidetransversely in either direction, a carrier flexibly supported by saidslide, a trunnioned support on said slide for said carrier which isarranged to facilitate a vertical and a tilting adjustment of thecarrier relative to the slide, a motor driven rotatable grinding wheelon said carrier, and spaced independent adjustable connections betweenthe opposite ends of said slide and said carrier whereby the carrier maybe adjusted vertically and may be tilted in a vertical plane tofacilitate a surface grinding on a stationary work piece.

3. A snagging grinder comprising a longitudinally movable carriage, apower operated means on said carriage operatively connected to traversesaid carriage longitudinally, a transversing movable slide on saidcarriage, power operated means on said slide operatively connected totraverse said slide transversely relative to said carriage, a carriermovably and flexibly supported by said slide, a trunnion support on saidslide for said carrier which is arranged to facilitate a vertical and atilting adjustment of the said carrier, a swing frame grinder includinga motor driven rotatable grinding wheel supported on said carrier, andindependent adjustable connections between the opposite ends of the saidslide and said carrier whereby the carrier may be adjusted verticallyand tilted in a vertical plane.

4. A snagging grinder, as claimed in claim 3, in combination with theparts and features therein specified of an adjustably mounted weight onsaid carrier, and means including a nut and screw mechanism operativelyconnecting the weight with the carrier to facilitate adjusting theposition of the weight relative to the carrier so as to vary thegrinding pressure of the grinding wheel upon the work piece beingground.

5. A snagging grinder, as claimed in claim 3, in combination with theparts and features therein specified of an adjustably mounted weight onsaid carrier, means including a nut and screw mechanism interposedbetween the carrier and the weight for adjusting the position of saidweight relative to .the carrier, and means including a power operatedmechanism on said carrier operatively connected to actuate said nut andscrew mechanism to facilitate adjusting the position of the weightrelative to the carrier so as to vary the grinding pressure of thegrinding wheel upon the work piece being ground.

References Cited in the file of this patent UNITED STATES PATENTS1,166,640 Shaw Jan. 4, 1916 1,413,928 Mummert Apr. 25, 1922 1,553,601Easton Sept. 15, 1925 1,800,307 Marschke Apr. 14, 1931 2,073,400 CummingMar. 9, 1937 2,308,842 Wilson Jan. 19, 1943 2,618,912 Cushman Nov. 25,1952 FOREIGN PATENTS 610,728 Germany Mar. 18, 1935

